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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca66fde6f250bb789a7e4f5f7e310b3ff34932fa33a51ed9e76b709b24e0bbc9' 
  AND token = 'XGtQuLzxh+BQIWc4/ymgrgkl8kqhWigYF1Xa6koaRLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}